Portable monitor



FIG. 1 is a front perspective view of a portable monitor showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in the figures are for the purpose of illustrating portions of the portable monitor, which form no part of the claimed design. 

CLAIM The ornamental design for a portable monitor, as shown and described. 